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Unit 1 Review…Which of the following part or parts of John Daltons Atomic Theory has been altered/changed since his time in the early 1800s? 1.All matter is composed of extremely small particles called atoms 2.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties 3.Atoms cannot be subdivided, created, nor destroyed 4.Atoms of different elements combine in simple whole-number ratios to form chemical compounds 5.In chemical reactions, atoms are combined, separated, or rearranged 11

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Unit 1 review… What are the three common parts of all atoms? AND, What are their masses in a.m.u.? 12

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Unit 1 review… Do all atoms of the same element have the same mass? Yes or NO…and What makes up the majority of mass of an atom? 13

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Unit 1 review… what is an isotope? (define) And… What makes one isotope of an element different from another isotope? 14

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Unit 1 review… What is the molar mass of the following three elements…(write your answer to three decimal places) – Carbon – Sulfur – Sodium 15

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END review for 2014… 16

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Unit 1 review… A certain metallic cylinder is made of bronze which is determined to be 80.0% tin and 20.0% copper. If the metal cylinder weighs grams, how much of the cylinder is tin and how much is copper? (in grams) Put answers in correct number of sig figs… 17

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Unit 1 review… A certain metallic cylinder is made of bronze which is determined to be 80.0% tin and 20.0% copper. If the metal cylinder weighs grams, how much of the cylinder is tin and how much is copper? (in grams) How many moles of copper is in this metal cylinder? (correct sig figs) 18